Dry season runs from May to October and is typically the best time to go to Zimbabwe. Water is scarce and the rivers and few permanent watering holes attract larger herds and a variety of species to specific and predicable locations for viewing. This is especially true in Hwange National Park, where pumped water holes maintained by safari lodges attract large numbers of elephant in particular.  This time of year also presents the lowest malaria risk to travelers.

The best times to view Victoria Falls tend to be June through September, when the climate is dry. The quantity of water is not so large that the spray blocks the view of the Falls, but still strong enough that the falls are more than the slight trickle that they become by end of dry season.
 
The overall best time to go for all national parks and game-viewing in Zimbabwe is May through September. May through August offer the most pleasant temperatures and possible afternoon rains that seldom interrupt the day’s activities. September and October are also great times to visit the parks, but higher temperatures and increased humidity make long days a little more challenging. Park activity is quiet and less crowded from November through April, and many lodges even close their operations during the height of the wet season which spans from December through March.